JSON data and expecting output

// JSON source data
[
    {
        "dates": [
            {
                "datetime": "2014-08-26",
                "deviceModels": [
                    {
                        "deviceModel": "Canon450MX",
                        "devices": [
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 10,
                                "serialNum" : "111"
                            },
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 10,
                                "serialNum" : "222"
                            },
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 10,
                                "serialNum" : "333"
                            }
                        ]
                    },
                    {
                        "deviceModel": "HPDeskjet",
                        "devices": [
                            {
                                "deviceModel": "HPDeskjet",
                                "inchesPrinted": 20,
                                "serialNum" : "444"
                            },
                            {
                                "deviceModel": "HPDeskjet",
                                "inchesPrinted": 20,
                                "serialNum" : "555"
                            }
                        ]
                    }
                ]
            },
            {
                "datetime": "2014-08-27",
                "deviceModels": [
                    {
                        "deviceModel": "Canon450MX",
                        "devices": [
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 5,
                                "serialNum" : "111"
                            },
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 25,
                                "serialNum" : "222"
                            },
                            {
                                "deviceModel": "Canon450MX",
                                "inchesPrinted": 15,
                                "serialNum" : "333"
                            }
                        ]
                    },
                    {
                        "deviceModel": "HPDeskjet",
                        "devices": [
                            {
                                "deviceModel": "HPDeskjet",
                                "inchesPrinted": 10,
                                "serialNum" : "444"
                            },
                            {
                                "deviceModel": "gx420d",
                                "inchesPrinted": 20,
                                "serialNum" : "555"
                            }
                        ]
                    }
                ]
            }
        ]
    }
]

// I'm aiming for this kind of output
[
{ date : 2014-08-26, deviceModel : 'Canon450MX', totalInchesPrinted : 30 },
{ date : 2014-08-26, deviceModel : 'HPDeskJet', totalInchesPrinted : 40 },
{ date : 2014-08-27, deviceModel : 'Canon450MX', totalInchesPrinted : 45 },
{ date : 2014-08-27, deviceModel : 'HPDeskJet', totalInchesPrinted : 30 }
]